Napkin ring display unit



FIG. 1 is a perspective view of a napkin ring display unit showing my new design;

FIG. 2 is a right side elevational view, the left side being a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a napkin ring display unit, as shown and described. 